ZOJ1045

#include<iostream>
#include<cstdio>

using namespace std;

bool OK(int n,float length)
{
float sum = 0;
for (int i=1; i<=n; i++)
{
sum += 1.0/(i+1);
if (sum >= length)
return true;
}
return false;
}

int main()
{
float length;

while (cin>>length && length != 0)
{
int head = 1, tail = 277;
int mid,ans;
while (head<tail)
{
mid = (head+tail)>>1;
if (OK(mid,length))
{
ans = mid;
tail = mid;
}
else
head = mid+1;
}
cout<<ans<<" card(s)"<<endl;
}

return 0;
}